Security Boss MaxSeal Hinged Replacement FlapsThe MaxSeal Hinge Replacement Flap features a heavy duty hinge flap connection. This hinged flap design allows the flap to travel freely without a pinch point. This means your flaps will last longer in situations of heavy use or if the installed pet door is too low and the pet is hitting the flap connection. All Security Boss products are hand built to order. Note: It is very important to install any vinyl flap pet door at least 2" higher than your